Lissie builds a website for Champ - or rather, it is built by Jack and Jill, the cyberspace online construction workers. Just for fun, they change the home page to say that all the pet owners in town are invited to a party at the Walkers' home. This is no laughing matter for Nick and Lissie's grandfather, who has come to visit, because he's allergic to animals. But Twipsy has a good idea...